Utahâs New State Stone: What is Honeycomb Calcite? Utahâs New State Stone: What is Honeycomb Calcite? and last updated 2021-03-31 23:59:41-04 HANNA, Utah â Did you know Utah has a new state stone? On March 16 The semi-precious stone was first discovered by Floyd Anderson in 1995. It is believed to have formed about 150 million years ago, âbelow sea level, and is now at ten thousand five hundred feet in the high Uintas,â said Rick Stott of Shamrock Mining in Hanna, Utah Stott and his wife Jeannie own Shamrock Mining in Hanna, Utah where they turn large pieces of the stone into slabs for building materials which are shipped around the world.